   # (a) Which aqueous solution is expected to have the higher boiling point: 0.10 m Na 2 SO 4 or 0.15 m sugar? (b) For which aqueous solution is the vapor pressure of water higher: 0.30 m NH 4 NO 3 or 0.15 m Na 2 SO 4 ? ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 13, Problem 54GQ
Textbook Problem
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## (a) Which aqueous solution is expected to have the higher boiling point: 0.10 m Na2SO4 or 0.15 m sugar? (b) For which aqueous solution is the vapor pressure of water higher: 0.30 m NH4NO3 or 0.15 m Na2SO4?

(a)

Interpretation Introduction

Interpretation: The aqueous solution having higher boiling point among 0.10mNa2SO4 and 0.15m sugar has to be determined.

Concept introduction:

Colligative properties: Properties of solutions which having influence on the concentration of the solute in it. Colligative properties are,

• Decrease in the vapor pressure
• Increase in the boiling point
• Decline in the freezing point
• Osmotic pressure

van’t Hoff factor, i: it is the ration between change in in freezing point measured and change in in freezing point calculated. It indicates the total number of ions that are produced.

### Explanation of Solution

Colligative properties are the properties of solutions which having influence on the concentration of the solute in it.

Boiling point of a solution increases with the increase in concentration of the solute in solution.

• Sugar is a non-electrolyte and hence i=1. So total concentration is 0.15m
• Na2SO4 is completely dissolved and produces 3 ions and hence i=3

(b)

Interpretation Introduction

Interpretation: The aqueous solution having higher vapor pressure among 0.30mNH4NO3 and 0.15mNa2SO4 has to be determined.

Concept introduction:

Colligative properties: Properties of solutions which having influence on the concentration of the solute in it. Colligative properties are,

• Decrease in the vapor pressure
• Increase in the boiling point
• Decline in the freezing point
• Osmotic pressure

van’t Hoff factor, i: it is the ration between change in in freezing point measured and change in in freezing point calculated. It indicates the total number of ions that are produced.

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